<Grid x:Name="LayoutRoot"
          Background="{Binding ColorCode, StringFormat='#\{0\}'}">
        <TextBox Height="23"
                 Width="100"
                 Text="{Binding ColorCode, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
        <TextBlock VerticalAlignment="Top"
                   HorizontalAlignment="Right"
                   Text="{Binding ColorCode}" />
    </Grid>

    public partial class MainPage : INotifyPropertyChanged {
        private string _colorCode;

        public string ColorCode {
            get { return _colorCode; }
            set {
                _colorCode = value;
                if (PropertyChanged != null)
                    PropertyChanged(this, new PropertyChangedEventArgs("ColorCode"));
            }
        }

        public MainPage() {
            InitializeComponent();
            DataContext = this;
        }

        public event PropertyChangedEventHandler Pr